Step staircase for pets



FIG. 1 is a perspective view of a step staircase for pets;

FIG. 2 is a top plan view thereof.

FIG. 3 is a left side elevational view thereof, the right side elevational view being a mirror image thereof,

FIG. 4 is a front elevational view thereof; and,

FIG. 5 is a rear elevational view thereof. 

The ornamental design for a step staircase for pets, as shown and described. 